4 ms·

The Hubble fork isn't "wrong". It's just a classification scheme. The fork has nothing to do with how spiral structures form or how long they last, it's just a

• garmaine 7y ago
  According to the article, it's a classification scheme that doesn't work. It describes categories that real galaxies don't fit in.
  • s1artibartfast 7y ago
    >Hubble's tuning fork has been more or less the standard for a century now. It's done a decent job, but there have been some galaxies that don't fit the pattern. For example, one might have a small bulge but tight arms, or another with a large bulge and fairly open arms. If there's a galaxy that didn't quite fit, astronomers usually used the arm structure to place it in the diagram. More specificly, it suggests that there are additional categories that should be added. The fork used 2 variables to come up with 6 combinations: bulge size( with 3 states) and bar presence (with 2 states). A third variable, arm angle, was assumed to be linked with bulge size. the data suggests that arm angle does not have the relation to bulge size that was assumed.
  • 8bitsrule 7y ago
    "It ain't what you don't know that gets you into trouble. It's what you know for sure that just ain't so." - (Somebody)